Availability:C-language interface function
atom_t PL_new_atom(const
char *)Return an atom handle for the given C-string. This function always
succeeds. The returned handle is valid as long as the atom is referenced
(see section
12.4.2.1). Currently aborts the process with a fatal error
on failure. Future versions may raise a resource exception and return (atom_t)0.
The following atoms are provided as macros, giving access to the
empty list symbol and the name of the list constructor. Prior to version 7,
ATOM_nil is the same as PL_new_atom("[]")
and
ATOM_dot is the same as PL_new_atom(".").
This is no longer the case in SWI-Prolog version 7.
- atom_t ATOM_nil(A)
- tomic constant that represents the empty list. It is advised to use PL_get_nil(), PL_put_nil()
or PL_unify_nil()
where applicable.
- atom_t ATOM_dot(A)
- tomic constant that represents the name of the list constructor. The
list constructor itself is created using
PL_new_functor(ATOM_dot,2).
It is advised to use
PL_get_list(), PL_put_list()
or PL_unify_list()
where applicable.